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Carbonaceous molded article for electrodes and method of manufacturing the same

Active Publication Date: 2017-04-20
KUREHA KAGAKU KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a carbonaceous molded article for electrodes that can be used in non-aqueous solvent secondary batteries such as lithium-ion batteries. The carbonaceous molded article has low electrical conductivity and contains almost no polymeric binder, which can swell and increase resistance due to the swelling of the binder. By using the carbonaceous molded article, the resistance of the electrode can be suppressed and high current density can be charged / discharged without overvoltage. Additionally, the carbonaceous molded article has excellent durability, low irreversible capacity, and high discharge capacity and efficiency. The carbonaceous molded article can also be used in all-solid-state secondary batteries.

Problems solved by technology

However, lithium-ion secondary batteries for vehicles are large and expensive, and are thus difficult to replace.
That is, it requires expensive manufacturing equipment and complex processes.
Additionally, the uniformity of electrode coating greatly affects variations in battery performance.
Furthermore, the speed of the coating step and drying step greatly affects battery manufacturing capacity.

Method used

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  • Carbonaceous molded article for electrodes and method of manufacturing the same
  • Carbonaceous molded article for electrodes and method of manufacturing the same
  • Carbonaceous molded article for electrodes and method of manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

manufacturing example 1

[0086]In this manufacturing example, a non-graphitizable carbonaceous material precursor was manufactured.

First, 70 kg of a petroleum-based pitch with a softening point of 205° C. and an H / C atomic ratio of 0.65 and 30 kg of naphthalene were loaded into a pressure-resistant container with an internal volume of 300 L and having a mixing impeller and an outlet nozzle, and after the substances were melted and mixed while heating at 190° C., the mixture was cooled to 80 to 90° C. The inside of the pressure-resistant container was pressurized by nitrogen gas, and the content was extruded from the outlet nozzle to obtain a string-shaped compact with a diameter of approximately 500 μm.

Next, this string-shaped compact was pulverized so that the ratio (L / D) of the diameter (D) and the length (L) was approximately 1.5, and the resulting fractured product was added to an aqueous solution in which 0.53 wt % of polyvinyl alcohol (degree of saponification: 88%) heated to 93° C. was dissolved, dis...

manufacturing example 2

[0087]In this manufacturing example, a graphitizable carbonaceous material precursor was manufactured.

First, 68 kg of a petroleum pitch having a softening point of 210° C., a quinoline insoluble content of 1 wt %, and an H / C atomic ratio of 0.63% and 32 kg of naphthalene were loaded into a pressure-resistant vessel having a mixing impeller and an internal volume of 300 L. After the substances were dissolved and mixed while heating at 190° C., the mixture was cooled to 80 to 90° C. and extruded to form a string-like compact with a diameter of approximately 500 μm.

Next, this string-shaped compact was pulverized so that the ratio of the diameter and the length was approximately 1.5, and the resulting pulverized material was dropped in a 0.53% polyvinyl alcohol aqueous solution (degree of saponification: 88%) heated to 93° C., and dispersed while stirring and then cooled to form a spherical pitch compact. After most of the water was removed by filtration, the naphthalene in the pitch co...

manufacturing example 3

[0088]The carbon precursor B obtained in the above Manufacturing Example 2 was heat treated for 1 hour at 480° C. in a nitrogen atmosphere, and a carbon precursor C was obtained.

This carbon precursor was pulverized to form carbon precursor fine particles having an average particle size of approximately 12 μm.

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Abstract

An object of the present invention is to provide a carbonaceous molded article for electrodes having high charge / discharge capacity, high initial charge / discharge efficiency, and excellent cycle life without a polymeric binder.The above object can be achieved by the carbonaceous molded article for electrodes of the present invention comprising a carbon fiber nonwoven fabric, the article having a thickness of not greater than 1 mm, an atomic ratio (H / C) of hydrogen atoms and carbon atoms according to elemental analysis of not greater than 0.1, a porosity determined from a bulk density and a butanol true density of the molded article of 25 to 80%, and a volatile content of not greater than 5.0 wt %.

Description

TECHNICAL FIELD[0001]The present invention relates to a carbonaceous molded article for electrodes and a method for manufacturing such an article.A secondary battery having excellent durability may be obtained by the present invention.In particular, a secondary battery having high charge / discharge efficiency and high discharge capacity may be obtained by a carbonaceous molded article for electrodes comprising a non-graphitizable carbonaceous material.Furthermore, a non-aqueous solvent secondary battery having excellent charge / discharge capacity and charge / discharge efficiency may be obtained by a carbonaceous molded article for electrodes comprising a graphitizable carbonaceous material.Additionally, electrode density may be increased and a secondary battery having high discharge capacity per unit volume may be obtained by a carbonaceous molded article for electrodes comprising a metal or a metal compound.BACKGROUND ART[0002]Recently, in the application of non-aqueous electrolyte se...

Claims

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Application Information

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IPC IPC(8): H01M4/587H01M4/133H01M4/1393H01M4/04
CPCH01M4/587H01M4/1393H01M4/133H01M4/0433Y02E60/10
Inventor KOBAYASHI, SHOTABABA, TAKANORIIMOTO, HIROSHIKOMATSU, MAYUSONOBE, NAOHIRO
Owner KUREHA KAGAKU KOGYO KK
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